How Can I Dynamically Load External Scripts in Angular?

Dynamically Loading External Scripts in Angular

Dynamic loading of external scripts allows Angular applications to defer the loading of third-party libraries until they are actually needed, improving performance and flexibility. However, the standard ES6 import mechanism is static and occurs during transpiling, making it unsuitable for this purpose.

Solution:

To dynamically load external scripts, we can utilize a custom service that manages script loading. One such service employs the following approach:

1. Create a Script Store:

Define an array of objects each containing the name and source path of a script:

const ScriptStore: Scripts[] = [
    {name: 'filepicker', src: 'https://api.filestackapi.com/filestack.js'},
    {name: 'rangeSlider', src: '../../../assets/js/ion.rangeSlider.min.js'}
];

2. Implement a Script Service:

Create a service that provides methods for loading scripts:

@Injectable()
export class ScriptService {

    private scripts: any = {};

    constructor() {
        ScriptStore.forEach((script) => {
            this.scripts[script.name] = {
                loaded: false,
                src: script.src
            };
        });
    }

    load(...scripts: string[]) {
        // Load multiple scripts in parallel
    }

    loadScript(name: string) {
        // Load a single script
    }
}

3. Dynamically Load Scripts:

Inject the ScriptService where needed and invoke load() to dynamically load scripts:

this.script.load('filepicker', 'rangeSlider').then(data => {
    console.log('Scripts loaded: ', data);
});

In this approach, the scripts are loaded dynamically during runtime, providing flexibility and control over external library loading in Angular applications.

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